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"Not seeing results soon enough is the number-one reason women give up on weight-loss plans," notes Patricia Bannan, RD, author of Eat Right When Time Is Tight. Carbalicious potatoes, pasta, and rolls raise levels of serotonin, a feel-good brain chemical, says Elizabeth Somer, RD, author of Eat Your Way to Sexy. To stop carbo-loading and fast-track your weight loss: In fact, Danish researchers found that subbing protein for one-eighth of the carbs you typically eat in a day allowed dieters to better maintain a recent weight loss.